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Grade 7 · Biology

Grade 7 Biology diagnostic

12 questions on plant biology, cells & microscopy and ecology & populations. Answer what you can, then check your answers to see which topics are secure and what to practise next.

12 questions3 topicsAbout 15 minutesSet 3 of 5

Skip a question if you do not know the answer. It is better than guessing, because it shows what to practise.

1Plant biologyIn supplied data, 137 of 198 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.
%
2Plant biologyWhich comparison can test a light-related effect more fairly?
3Plant biologyMust pollination always be carried out by insects?
4Plant biologyIn supplied data, 64 of 98 seeds germinated under the stated test conditions. Find the sample germination percentage. Round to 3 decimal places if needed. Answer in %.
%
5Cells & microscopyA printed image is 48 mm long at 500× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.
µm
6Cells & microscopyAn object is 20 µm long and its image is 2000 µm long. Find magnification.
7Cells & microscopyWhich statement is most accurate?
8Cells & microscopyA printed image is 51 mm long at 500× magnification. Find the actual length in micrometers. Round to 3 decimal places if needed. Answer in µm.
µm
9Ecology & populationsA supplied food-web model transfers 15% of 226 kJ to the next level. Find transferred energy. The stated efficiency is not a universal ecological constant. Round to 3 decimal places if needed. Answer in kJ.
kJ
10Ecology & populationsWhich is a primary producer in this simple land food chain?
11Ecology & populationsA supplied food-web model transfers 20% of 724 kJ to the next level. Find transferred energy. The stated efficiency is not a universal ecological constant. Round to 3 decimal places if needed. Answer in kJ.
kJ
12Ecology & populationsA stated model transfers 20% of 500 energy units to the next level. How many units are transferred?